Sure, we want it!!!
If it's a prop with internal geometry (as it should be in P4, and in most other cases) We'll only need the prop itself and the .rsr with the same name (.png in newer versions)
If it has an external geometry, we'll need the .obj file as well(with the right path)
Put it all in a .zip with a little "readme.txt" with information about use restrictions and your name, of course. A "talking name" for the .zip would be nice
When uploading it, you may choose a license, too. Also a preview pic would be nice (the above will do) If you have any problems or questions, just contact me.